Rock-drill



(No Model.) 3 Sheets-Sheet 1.

A J. M. RAMO-R.

RQGK DRILL. l

Patented Nov. 9, 1897.

Inventor.

Attorn Vitnesses.

fu: cams vzrzns oo.. Norg-ums., wasnmnrou, u c4 (No Model.) 3Sheets-'Sheet 2. J. M. HAMOR. ROCK DRILL. N0. 593i214'. Patented Nov'.9, 1897.

Witnesses.

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3 Sheets-Sheet 3. J. M. HAMOR. ROGK DRILL.

Patented Nov. 9, 1897.

(No Rodel.)

VVtnesses. M y, ma

UNITED STATES PATENT JOHN M. IIAMOR, OF PHILADELPHIA, PENNSYLVANIA,ASSIGNOR TO JOHN M. ROGERS, OF IVILMINGTON, DELAVARE.v

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 593,214, dated November9, 189'?.

Application tiled March 3l, 1897.

To all whom. t nrty concern:

Be it known that I, JOHN M. IIAMOR, a citizen of the United States,residing at Philadelphia, county of Philadelphia, and State ofPennsylvania, have invented a new and useful Improvement in Rock-Drills,of which the following is a full, clear, and exact description,reference being had tothe accompanying drawings, which form a part ofthis specification.

My invention has for its object a novel construction of valve and itsconnection with the piston of the rock-drill, whereby air or otherpressure iiuid is alternately admitted to 0pposite ends of therock-drill piston, which causes it to reciprocate. l

My invention consists also in providing the head of the rock-drill withan engine operated by the same air or other Huid which operates thepiston, the engine being used for the purpose of rotating the drill, soas to present different cutting edges of the tool to the work.

I will first describe my invention as illustrated in the accompanyingdrawings, and then particularly point out my invention in the claims.

In the drawings, Figure l is a vertical lon gitudinal section throughthe piston and valve. Fig. 2 is a section on the 1ine2 2, Fig. l. Fig. 3is a section on the line 3 3, Fig. l. Fig. 4 is a section on the line it4, Fig. l. Fig. 5 is a section on the line 5 5, Fig. l. Fig. 6 is adetail perspective of valve and piston.

A represents the supporting-frame of the machine, B the drill-head, andB the pistonrod.

O is the cylinder. Connected to this cylinder is the nut D, which Workson the threaded shaft E, operated by the crank F, so that the piston andthe cylinder of the rock-drill may be carried by rotating the handle.

B2 is the piston, having the heads h and b. Between them is the cut-awayportion b2.

G- is the valve-casing, and G is the live-air chamber of the valve, towhich the live air or other iiuid is admitted through iexible passageG2, and Gr3 is the exhaust-passage.

From the live-air chamber G', by means of the passages g3 g, air passesto the space H on opposite sides of the valve-piston H, and

Serial No. 630,040. (No model.)

7L and 7i are passages leading from the space H on opposite sides of thevalve-piston H to the cylinder C.

Il2 is the valve.

Leading from the chamber G there are the passages h3 and h4, thepassages 72.3 and 7a4 leading to opposite ends of the cylinder.

In one position of the valve H2 the passage 77,3 is in communicationwith the exhaust-passage g3, while the passage 71.4 is in communi- 6ocation with the liveair chamber G. Under these conditions, the pistonbeing in the position shown in Fig. l, the passage 72. from one side ofthe valve-piston H is in communication with the exhaust, while thepassage 72l is closed by the piston-head Zi, so that airpressure is onthe side of the piston H correspending to the passage 72.. Under theseconditions the piston B will be moved toward the left. vIt will move sountil the portion h2 7o closes the connection with the passage4 7L, atwhich time the passage 7L will be closed by the head h of the piston.Under these conditions the air will be exhausted from the side of thevalve-piston corresponding to the 75 passage 7L and the live air on theside correspending to the passage 7i. will become active.

This will shift the valve H2, so that the passage 72.4 will be connectedwith the exhaust and the passage 72.3 with the live-air chamber 8o G. Asa consequence live air will be admitted to the left side of the pistonand the righthand side Will be open to the exhaust, under which'condition the piston will be moved in the reverse direction until itreaches the position shown in Fig. l, at which time the passage 7L willbe closed by the head C of the piston and the passage 7L open to theexhaust, and under these conditions the valve will reverse, bringing itagain into the position 9o shown in Fig. l.

So much for the operation of the valve and its control of the piston.The advantage of such a construction as this is that the valve is arotary valve, and, second, is at all times on both sides under theaction of pressure, so that it is always ready to become active. Again,it is very simple in construction and certain in its action.

In order to perform the other novel feature Ico of my inventionto wit,of rotating the piston at the-desired points-I prefer the followingconstruction:

The piston B has a portion of its interior cut out so as to form arectangular orifice, in which rectangular oriiice is placed the shaft I,u'ponthe end of which is mounted the ratchet-wheel J, operated uponbythe spring-pawls jj. These pawls are operated in the following manner:kThe pawls are mounted in a ring K, mounted loosely in the head I.Connected with this ring K is the piston 7e, which piston is operated inthe 'following manner:

In the cylinder C are the ports c c', connecti ing with the passages h3h4, alsoconnecting with the passages c2 c3, leading to opposite sides ofthe piston 7e'. In the movement of the valve H2 the ports c el arealternately connected with pressure and exhaust. The port c admits theair to one side of the piston k and the port c to the other side of thepiston 7c. The movement or" the piston 7a in one direction causes thepawls either j or ,7" to act upon the ratchet and rotate the shaftI, andwith it the piston, While when the air is admitted to the other side ofthe piston 71: it causes the ringJ, and with itthe pawls, to be moved inthe opposite direction, preparatory for another action upon the ratchet.

In order to avoid the necessity of having a short crown-tooth or, whatis the same thing, a large number of teeth, I- use the two pawls, whichare so set that one or the other of the pawls is always in activeposition. By this arrangement the piston is automatically turned at eachstroke of the piston.

Instead of the pawls being on the ring they may be placed on the shaft Iand the ring K internally toothed, so that motion is transmitted by themovable ratchets acting upon the pawls.

Having now fully described my invention,

what I claim, and desire to protect by Letters Patent, is-- 1. In anautomatic engine, in combination, a cylinder, a piston having a cut-awayportion, a valve-casing having two chambers one directly in connectionwith the source of pressure supply and exhaust, the other having twopassages leading to the cylinder, a valve in one chamber and avalve-piston in the other, and passages leading from the valvechambertothe valve-piston chamber on opposite sides of the valve-piston, andpassages leading from the valve-chamber to opposite ends of thepiston-chamber.

2. In a rock-drill, in combination, a cylinder, 'a piston in saidcylinder, and pressure and exhaust passages for controlling thereciprocation of said piston, a spindle upon which said piston isadapted to reciprocate and with which it is adapted to rotate, a ratchetmounted upon said spindle, a rin g provided with a bearing upon which itis adapted to rotate concentric with the piston rotation, and connectionbetween said ring and the spindle whereby when the ring is moved in onedirection the spindle is rotated, a second ary piston connected withsaid ring, a pistonchamber for said piston and connection betweenopposite sides of said piston and the main cylinder adjacent to thepressure and exhaust passages.

3. In a rock-drill, in combination, a cylinder, a piston in saidcylinder and pressure and exhaust passages for controlling thereciprocation of said piston, a spindle upon which said piston isadapted to reciprocate and with which it is adapted to rotate, a ratchetmounted upon said spindle, a ring provided with a bearing upon which itis adapted to rotate concentric with the piston rotation, a pawlconnected with said ring adapted to coact with said ratchet, a secondarypiston connected with said ringa piston-chamber for said piston andconnection between opposite sides of said piston and the main cylinderadjacent to the pressure and exhaust passages whereby when in theoperation of the main piston pressure is admitted to one side of thesecondary piston the pawl is moved into operative position, and whenpressure is admitted to the opposite side of said secondary piston thepawl is operated to turn the ratchet and with it the main piston.

In testimony of which invention I have hereunto set my hand.

JOHN M. IIAMOR.

Witnesses:

M. F. ELLIS, CAROL H. DEsHoNGs.

